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发明名称
DRILL COLLAR
摘要
申请公布号
GB1599331(A)
申请公布日期
1981.09.30
申请号
GB19780005134
申请日期
1978.02.08
申请人
ARNOLD J F
发明人
分类号
E21B17/16;(IPC1-7):E21B7/10
主分类号
E21B17/16
代理机构
代理人
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地址
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